Avast cleanup

Hi all,

Question about cleanup from avast, avastcleanup did a scan and found 9 problems with 28 Gig of files, unnecessary applications and system settings is it safe to use teh : optimize my computer button or wil it also delete files and things from my programs ? becose i have a lot of files from 3 d max and games and other stuff i dont wanna loose

https://forum.avast.com/index.php?board=63.0